LIST OF THE WOOD-CUTS. xi 



Fig. 151. Profile view, somewhat magnified, of Halopsis CRUCiATA 102 



" 152. Natural attitude of the same Medusa (Fig. 151) 102 



" 153. Abactinal view of Zygodactyla groenlandica 104 



'■ 154. Profile view of Fig. 153, half natural size 104 



" 155. Portion of the circular tube . . . . . . . . . . .104 



" 156. Young Zygodactyla, greatly magnified . 105 



" 157. Profile view of Zygodactyla crassa, somewhat reduced in size . . . 106 



" 158. Quarter-disk of Zygodactyla crassa . . . . . . . . . 107 



" 159. Portion of the disk of Zygodactyla CYANEA, from the abactinal pole. (L. Ag.) 107 



" 159'. Crematostoma flava, in profile 109 



" 160. Portion of the disk of iEQUOREA ALBIDA, from the abactinal pole . . . 110 



" 161. A natural attitude of iEquorea albida ......... 110 



" 162. Magnified view of the marginal tube ........ Ill 



" 163. EiRENE ocERULEA. (L. Agassiz.) 112 



" 164. TiMA FORMOSA, half natural size 113 



" 165. Quarter of the disk, from the abactinal pole, natural size 113 



" 166. Digestive cavity and actinostome 113 



" 167. Portion of the ovary 114 



" 168. Magnified portion of the circular tube 114 



" 169. Young Tinia formosa, natural size . ......... 114 



" 170. Digestive cavity of Fig. 169 114 



" 171. Young Planula; of Tima 115 



" 172. Single Hydra of the tuft of a Tima Hydrai-ium, greatly magnified . . . 115 



" 173. Profile of EuTiMA LiMPiDA, reduced in size 116 



" 174. Quarter-disk of Fig. 1 73 . 116 



" 175. Magnified view of proboscis and genital organs .117 



" 176. Magnified portion of a part of the circular canal 117 



" 177. Magnified marginal capsule . . . . . . . . . . .117 



" 1 78. Magnified view of the rudimentary tentacles 117 



" 179. Profile view, somewhat magnified, of PoLYORCHis PENICILLATA . . . 119 



" 180. Ovaries of one of the chymiferous tubes ........ 119 



" 181. Section of bell 120 



" 182. Part of disk of Fig. 1 79, seen from the abactinal pole 120 



" 183. Two of the marginal tentacles in a contracted state 120 



" 184. Adult Medusa of Lafcea CALCARATA 122 



" 185. One of the ovaries and the actinostome 123 



" 186. Actinostome, actinal view 123 



" 187. Magnified view of a portion of the circular tube 123 



" 188. Actinostome and rudimentary ovaries, seen in profile . . . . . 123 



" 189. Different attitude of Medusa of Fig. 184 124 



" 190. Hydrarium of Lafoea calcarata 124 



" 191. Reproductive calycle 125 



" 192. Medusa immediately after its escape from the reproductive calycle . . . 125 



" 193. Medusa somewhat more advanced, from the abactinal pole ..... 125 



" 194. Young Medusa still further advanced than Fig. 193 126 



" 195. Laodicea cellularia . 127 



" 196. One of the lips of the actinostome . 127 



" 197. Gonionemus VEETENS, attached by its tentacles 129 



" 198. The same in motion, natural size 129 



" 199. Base of a contracted tentacle .......... 130 



" 200. A portion of the genital organs 130 



" 201. One of the chymiferous tubes and half the digestive cavity 130- 



" 202. Profile of Melicertum campanula, natural size 131 



" 203. Profile view of a very young Melieertum campanula ...... 132 



" 204. Half the disk of the same, seen from the actinal pole 132 



" 205. Young Melieertum, having only four completely formed chymiferous tubes . .132 



" 206. Same, seen from the abactinal pole 133 



" 207. Magnified view of the two chymiferous tubes and genital glands . . . .133 



" 208. Mode of carrying the lips of actinostome 133 



